Since then, the company has tinkered with its egg supply chain to alleviate the shortage, according to the release.

“We know it’s been a tough couple of weeks for our customers, but we’re really grateful for their support while we worked to build up our egg supply,” Whataburger Chief Operating Officer Dino Del Nano said in a statement. “All of us at Whataburger are so happy to get back to normal.”

Avian flu broke out in Midwestern states — mostly Iowa, Minnesota and Wisconsin — in early April, according to the United States Department of Agriculture.

Thirty-seven outbreaks of avian flu have been reported among commercial chicken populations since May 1, according to the USDA. The most recent outbreak was detected in Wright County, Iowa on Wednesday, affecting one million chickens. The outbreaks have affected 28.6 million chickens altogether.

On Monday, the wholesale price of a carton of large eggs ranged from $2.20 to $2.34 in the south central region, which includes Texas, according to USDA data. That’s down from the range of $2.44 to $2.52 at the beginning of June. But it’s up from $1.13 to $1.21 at the beginning of May.

Whataburger isn’t the only company to change its routine in response to the shortage. Earlier this month, H-E-B began limiting its customers to three cartons of eggs. The rule, enforced by signs at all of H-E-B’s Texas stores, is meant to discourage commercial purchases of eggs. H-E-B’s limit was still in effect on Friday, spokeswoman Kimberly Harle said.